Acrylic protective film for camera module and preparation method thereof

Abstract

The invention discloses an acrylic protective film for a camera module and a preparation method of the acrylic protective film. The protective film comprises a base material layer, an acrylic adhesive layer and a release layer which are sequentially stacked. The acrylic adhesive layer is low-viscosity, low-climbing and residue-free pressure-sensitive adhesive, the viscosity range of the acrylic adhesive layer is 50-100 gf / in, the camera module can be effectively adhered due to proper adhesive force, and unnecessary falling or sliding in the processes of transportation, jolting and manual assembly is avoided; the acrylic adhesive layer is a polymer adhesive with high molecular weight and high modulus, and the flexible movement of a macromolecular chain segment under long-time wetting in a high-temperature environment can be effectively reduced by selecting a high-steric-hindrance hard monomer containing a benzene ring and the like, so that the low climbing of the adhesive force in the aging process of the acrylic adhesive layer can be realized; the falling of the super black ink on the surface of the camera module in the waste discharge process is reduced; in addition, by adding the antistatic agent, the adsorption effect of static electricity on the super black ink in the manual stripping process can be effectively avoided.

Description

Technical Field

[0001] The invention relates to the field of protective film materials, and in particular to an acrylic protective film for a camera module and a preparation method thereof. Background Art

[0002] In the field of electronic devices such as mobile phones and tablets, the camera function has become increasingly inseparable from human life. The super black ink coated on the surface of the camera module has poor adhesion to the module due to the particularity of its manufacturing process. Even a slight bump will cause the super black ink to fall off, thereby increasing the defective rate of the camera module. The general traditional storage method is to store each camera module in a separate grid, but this method will lead to a waste of storage space and further increase costs. Similarly, it still cannot avoid defects caused by transportation and bumps. Conventional acrylic protective film tapes have the phenomenon of high climbing and easy residual glue after aging. When tearing off the surface of the camera module, it is very easy to cause the super black ink to fall off. In order to further reduce the defects caused by the storage, transportation, and assembly of the camera module, it is of great significance to develop a low-climbing, no-residue acrylic protective film pressure-sensitive tape. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an acrylic protective film for a camera module and a preparation method thereof in view of the deficiencies in the above-mentioned prior art.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is as follows: In a first aspect of the present invention, an acrylic protective film for a camera module is provided, comprising a substrate layer, an acrylic adhesive layer and a release layer which are sequentially stacked;

[0005] The acrylic adhesive layer is obtained by coating an acrylic adhesive solution on the substrate layer and then curing the acrylic adhesive solution. The acrylic adhesive solution comprises the following raw material components in parts by weight: 100 parts of a polymer adhesive, 1-5 parts of an antistatic agent, 0.5-8 parts of a curing agent, and 10-80 parts of a solvent.

[0006] Preferably, the raw materials for preparing the polymer adhesive include, by weight:

[0007] 50-150 parts of soft monomer, 5-20 parts of hard monomer, 2-10 parts of functional monomer, 0.05-0.6 parts of initiator, and 50-200 parts of solvent.

[0008] Preferably, the soft monomer is at least one of ethyl acrylate, butyl acrylate and isooctyl acrylate.

[0009] Preferably, the hard monomer is at least one of methyl acrylate, methyl methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, styrene and vinyl acetate.

[0010] Preferably, the functional monomer is at least one of acrylic acid, methacrylic acid, acryloylmorpholine, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate and maleic anhydride.

[0011] Preferably, the initiator is at least one of azobisisobutyronitrile, azobisisoheptanenitrile and tert-butyl peroxyhexahydroterephthalate.

[0012] Preferably, the raw materials for preparing the polymer adhesive include, by weight:

[0013] Soft monomer butyl acrylate 30-70 parts, soft monomer isooctyl acrylate 20-50 parts, hard monomer cyclohexyl methacrylate 5-20 parts, functional monomer acrylic acid 1-5 parts, functional monomer acryloyl morpholine 1-5 parts, initiator azobisisobutyronitrile 0.05-0.5 parts, initiator tert-butyl peroxide hexahydroterephthalate 0.01-0.1 parts, solvent 50-200 parts.

[0014] Preferably, the preparation method of the polymer adhesive comprises the following steps:

[0015] S1, mixing soft monomers, hard monomers and functional monomers to obtain a monomer mixture, and adding a portion of the monomer mixture into a reaction container;

[0016] S2, after passing nitrogen into the reaction vessel for 10-30 minutes, heat to 55-70°C and continue stirring, keep warm for 0.5 hours, add part of the initiator dropwise, and react for 0.5-3 hours;

[0017] S3, keeping the temperature constant, adding the remaining monomer mixture dropwise into the reaction vessel, and reacting at 55-70° C. for 0.5-3 hours;

[0018] S4, raising the temperature to 65-80°C, adding the remaining initiator dropwise, and reacting for 2-5 hours;

[0019] S5. After the reaction product is cooled to room temperature, a solvent is added to dilute and stir to obtain a polymer adhesive.

[0020] Preferably, the antistatic agent is at least one of polypyrrole, polythiophene and polyaniline.

[0021] Preferably, the cross-linking agent is at least one of an isocyanate curing agent, an epoxy curing agent, an aziridine curing agent, and a triethylenetetramine curing agent.

[0022] Preferably, the solvent is at least one of toluene, ethyl acetate, ethanol, propanol, butanol and butanone.

[0023] A second aspect of the present invention provides a method for preparing the acrylic protective film for a camera module as described above, comprising the following steps:

[0024] The polymer adhesive, antistatic agent, curing agent and solvent are uniformly mixed to obtain an adhesive, the adhesive is coated on a substrate, and the adhesive is dried and cured at 60-130° C. to form an acrylic adhesive layer, a release layer is attached to the adhesive surface of the acrylic adhesive layer, and the adhesive is cured at 50-70° C. for 48-72 hours to obtain an acrylic protective film for a camera module.

[0025] The beneficial effects of the present invention are:

[0026] The present invention provides an acrylic protective film with low climbing and no residual adhesive characteristics and a preparation method thereof, which can be well applied to the lamination of camera modules; the acrylic protective film prepared by the present invention comprises a substrate layer, an acrylic adhesive layer and a release layer in the order of lamination, the acrylic adhesive layer is a low-viscosity, low-climbing, and no residual adhesive pressure-sensitive adhesive, and its viscosity range is 50-100gf / in. Suitable bonding force can effectively adhere to the camera module to avoid unnecessary falling off or sliding during transportation, bumps, and assembly by workers; the acrylic adhesive layer is a high-molecular-weight, high-modulus polymer adhesive, and the selection of hard monomers with high steric hindrance such as benzene rings can effectively reduce the flexible movement of polymer chain segments under high-temperature environments and long-term wetting, thereby achieving low climbing of bonding force during aging of the acrylic adhesive layer and reducing the falling off of super black ink on the surface of the camera module during waste discharge; in addition, the addition of an antistatic agent can effectively avoid the adsorption of static electricity on the super black ink during manual stripping. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with embodiments so that those skilled in the art can implement the invention with reference to the description.

[0028] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0029] The test methods used in the following examples are conventional methods unless otherwise specified. The materials and reagents used in the following examples are all commercially available unless otherwise specified. In the following examples, if no specific conditions are specified, the experiments were carried out under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0030] The present invention provides an acrylic protective film for a camera module, comprising a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence;

[0031] The acrylic adhesive layer is obtained by coating an acrylic adhesive liquid on the substrate layer and then curing the acrylic adhesive liquid. The acrylic adhesive liquid comprises the following raw material components in parts by weight: 100 parts of a polymer adhesive, 1-5 parts of an antistatic agent, 0.5-8 parts of a curing agent, and 10-80 parts of a solvent.

[0032] The acrylic protective film provided by the present invention has suitable adhesion, can effectively adhere to the camera module, and avoid unnecessary falling off or sliding during transportation, bumps, and assembly by workers. The polymer adhesive with higher molecular weight and high steric hindrance can effectively reduce the movement of polymer chain segments, thereby achieving a low increase in adhesion during the aging process of the acrylic adhesive layer and reducing the falling off of the super black ink on the surface of the camera module during the waste discharge process.

[0033] In a preferred embodiment, the release layer is a release film or release paper, which can be single-sided release or double-sided release. The release force and release thickness are not limited. The present invention mainly uses a release film.

[0034] In a preferred embodiment, the substrate layer is one of PET, PI, PP and PE, and the thickness of the substrate is not limited. The present invention mainly uses PET substrate.

[0035] In a preferred embodiment, the raw materials for preparing the polymer adhesive include, by weight:

[0036] 50-150 parts of soft monomer, 5-20 parts of hard monomer, 2-10 parts of functional monomer, 0.05-0.6 parts of initiator, and 50-200 parts of solvent.

[0037] In a preferred embodiment, the soft monomer is at least one of ethyl acrylate, butyl acrylate, and isooctyl acrylate.

[0038] In a preferred embodiment, the hard monomer is at least one of methyl acrylate, methyl methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, styrene and vinyl acetate.

[0039] In a preferred embodiment, the functional monomer is at least one of acrylic acid, methacrylic acid, acryloylmorpholine, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate and maleic anhydride.

[0040] In a preferred embodiment, the initiator is at least one of azobisisobutyronitrile, azobisisoheptanenitrile and tert-butyl peroxyhexahydroterephthalate. More preferably, a combination of azobisisobutyronitrile and tert-butyl peroxyhexahydroterephthalate is used.

[0041] In a preferred embodiment, the molecular weight of the polymer adhesive should be maintained at 900,000-1.5 million. When the molecular weight is low, the prepared acrylic protective film has a higher adhesion to the super black ink on the surface of the camera module, and the better wettability allows the ink to be taken away when the tape is peeled off.

[0042] In a preferred embodiment, the raw materials for preparing the polymer adhesive include, by weight:

[0043] Soft monomer butyl acrylate 30-70 parts, soft monomer isooctyl acrylate 20-50 parts, hard monomer cyclohexyl methacrylate 5-20 parts, functional monomer acrylic acid 1-5 parts, functional monomer acryloyl morpholine 1-5 parts, initiator azobisisobutyronitrile 0.05-0.5 parts, initiator tert-butyl peroxide hexahydroterephthalate 0.01-0.1 parts, solvent 50-200 parts.

[0044] In a preferred embodiment, the method for preparing the polymer adhesive comprises the following steps:

[0045] S1, mixing soft monomers, hard monomers and functional monomers to obtain a monomer mixture, and adding a portion of the monomer mixture into a reaction container;

[0046] S2, after passing nitrogen into the reaction vessel for 10-30 minutes, heat to 55-70°C and continue stirring, keep warm for 0.5 hours, add part of the initiator dropwise, and react for 0.5-3 hours;

[0047] S3, keeping the temperature constant, adding the remaining monomer mixture dropwise into the reaction vessel, and reacting at 55-70° C. for 0.5-3 hours;

[0048] S4, raising the temperature to 65-80°C, adding the remaining initiator dropwise, and reacting for 2-5 hours;

[0049] S5. After the reaction product is cooled to room temperature, a solvent is added to dilute and stir to obtain a polymer adhesive.

[0050] In a preferred embodiment, the antistatic agent is at least one of polypyrrole, polythiophene and polyaniline. More preferably, polythiophene antistatic agent is used.

[0051] In a preferred embodiment, the crosslinking agent is at least one of an isocyanate curing agent, an epoxy curing agent, an aziridine curing agent, and a triethylenetetramine curing agent. More preferably, a combination of an isocyanate curing agent and an epoxy curing agent is used.

[0052] The solvent may be a non-polar solvent or a strongly polar solvent. In a preferred embodiment, the solvent is at least one of toluene, ethyl acetate, ethanol, propanol, butanol and butanone.

[0053] The present invention also provides a method for preparing the acrylic protective film for a camera module as described above, comprising the following steps:

[0054] The polymer adhesive, antistatic agent, curing agent and solvent are uniformly mixed to obtain an adhesive, the adhesive is coated on a substrate, and the adhesive is dried and cured at 60-130° C. to form an acrylic adhesive layer, a release layer is attached to the adhesive surface of the acrylic adhesive layer, and the adhesive is cured at 50-70° C. for 48-72 hours to obtain an acrylic protective film for a camera module.

[0055] The above is the overall concept of the present invention, and detailed embodiments and comparative examples are provided below on the basis of the overall concept of the present invention to further illustrate the present invention.

[0056] Example 1

[0057] An acrylic protective film for a camera module comprises a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence; and a preparation method thereof comprises the following steps:

[0058] Step 1: Preparation of polymer adhesive:

[0059] Weigh 50 parts of butyl acrylate, 34 parts of isooctyl acrylate, 12 parts of cyclohexyl methacrylate, 3 parts of acrylic acid, and 1 part of acryloylmorpholine by weight, and add 1 / 3 of the obtained mixed monomers into a three-necked flask, pass nitrogen and stir to remove all air in the flask, heat to 65°C, keep warm for 30 minutes, then drop 0.1 parts of azobisisobutyl cyanide, react for 1.5 hours, keep the temperature unchanged, drop the remaining monomers into the flask, react for 2 hours, heat to 70°C, drop 0.05 parts of tert-butyl peroxide hexahydroterephthalate, react for 4 hours, and after the reaction solution is cooled to room temperature, add 150 parts of isocyanate solvent to dilute, stir evenly, and obtain a polymer adhesive.

[0060] Step 2: Prepare protective film

[0061] 1. By weight, 100 parts of the polymer adhesive prepared above were weighed, 2 parts of polythiophene antistatic agent, 3 parts of isocyanate curing agent L75 (Covestro), 1.5 parts of epoxy curing agent TETRAD-C (Mitsubishi Chemical) were added, and 40 parts of ethyl acetate solvent was used to dilute to a suitable viscosity and then stirred by high-speed mechanical stirring to obtain the corresponding adhesive.

[0062] 2. The adhesive prepared above is evenly coated on the PET substrate layer, dried and foamed in an oven to form an acrylic adhesive layer with a thickness of 50 μm, and finally a release film is attached to form an acrylic protective film; the oven temperature is as follows: the temperature of the first section oven is set to 60°C, the temperature of the second section oven is set to 75°C, the temperature of the third section oven is set to 75°C, the temperature of the fourth section oven is set to 135°C, the temperature of the fifth section oven is set to 135°C, the temperature of the sixth section oven is set to 135°C, and the temperature of the seventh section oven is set to 75°C; the machine speed is 15 m / min, and the length of each oven section is 6 m.

[0063] Comparative Example 1

[0064] An acrylic protective film for a camera module comprises a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence; and a preparation method thereof comprises the following steps:

[0065] Step 1: Preparation of polymer adhesive:

[0066] Weigh 60 parts of butyl acrylate, 34 parts of isooctyl acrylate, 2 parts of cyclohexyl methacrylate, 3 parts of acrylic acid, and 1 part of acryloylmorpholine by weight, and mix them. Take 1 / 3 of the weight of the obtained mixed monomer and add it into a three-necked flask. Stir with nitrogen to remove all air in the flask. Heat to 63°C, keep warm for 30 minutes, then drop 0.1 parts of azobisisobutyl cyanide, react for 1.5 hours, heat to 67°C, drop the remaining monomer into the flask, react for 2 hours, heat to 70°C, drop 0.05 parts of tert-butyl peroxide hexahydroterephthalate, react for 4 hours, and after the reaction solution is cooled to room temperature, add 150 parts of ethyl acetate solvent to dilute it, stir evenly, and obtain a polymer adhesive.

[0067] Step 2: Prepare protective film

[0068] 1. By weight, 100 parts of the polymer adhesive prepared above, 3 parts of isocyanate curing agent L75 (Covestro), and 1.5 parts of epoxy curing agent TETRAD-C (Mitsubishi Chemical) were weighed, diluted to a suitable viscosity with 40 parts of ethyl acetate solvent, and then stirred at a high speed to obtain the corresponding adhesive.

[0069] 2. The adhesive prepared above is evenly coated on the PET substrate layer, dried and foamed in an oven to form an acrylic adhesive layer with a thickness of 50 μm, and finally a release film is attached to form an acrylic protective film; the oven temperature is as follows: the temperature of the first section oven is set to 60°C, the temperature of the second section oven is set to 75°C, the temperature of the third section oven is set to 75°C, the temperature of the fourth section oven is set to 135°C, the temperature of the fifth section oven is set to 135°C, the temperature of the sixth section oven is set to 135°C, and the temperature of the seventh section oven is set to 75°C; the machine speed is 15 m / min, and the length of each oven section is 6 m.

[0070] Comparative Example 2

[0071] An acrylic protective film for a camera module comprises a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence; and a preparation method thereof comprises the following steps:

[0072] Step 1: Preparation of polymer adhesive:

[0073] Weigh 50 parts of butyl acrylate, 34 parts of isooctyl acrylate, 12 parts of cyclohexyl methacrylate and 3 parts of acrylic acid by weight, add all of them into a three-necked flask, stir with nitrogen to remove all the air in the flask, heat to 65°C, keep warm for 30 minutes, then drop 0.1 parts of azobisisobutyl cyanide, react for 4 hours, heat to 70°C, drop 0.05 parts of tert-butyl peroxyhexahydroterephthalate, react for 4 hours, wait for the reaction solution to cool to room temperature, add 150 parts of ethyl acetate solvent to dilute, stir evenly to obtain a polymer adhesive.

[0074] Step 2: Prepare protective film

[0075] 1. By weight, 100 parts of the polymer adhesive prepared above were weighed, 2 parts of polythiophene antistatic agent, 3 parts of isocyanate curing agent L75 (Covestro), 1.5 parts of epoxy curing agent TETRAD-C (Mitsubishi Chemical) were added, and 40 parts of ethyl acetate solvent was used to dilute to a suitable viscosity and then stirred by high-speed mechanical stirring to obtain the corresponding adhesive.

[0076] 2. The adhesive prepared above is evenly coated on the PET substrate layer, dried and foamed in an oven to form an acrylic adhesive layer with a thickness of 50 μm, and finally a release film is attached to form an acrylic protective film; the oven temperature is as follows: the temperature of the first section oven is set to 60°C, the temperature of the second section oven is set to 75°C, the temperature of the third section oven is set to 75°C, the temperature of the fourth section oven is set to 135°C, the temperature of the fifth section oven is set to 135°C, the temperature of the sixth section oven is set to 135°C, and the temperature of the seventh section oven is set to 75°C; the machine speed is 15 m / min, and the length of each oven section is 6 m.

[0077] Comparative Example 3

[0078] An acrylic protective film for a camera module comprises a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence; and a preparation method thereof comprises the following steps:

[0079] Step 1: Preparation of polymer adhesive:

[0080] Weigh 90 parts of butyl acrylate, 1 part of isooctyl acrylate, 6 parts of vinyl acetate, and 3 parts of acrylic acid by weight, mix them, take 1 / 3 of the weight of the obtained mixed monomer and add it into a three-necked flask, stir with nitrogen to remove all the air in the flask, raise the temperature to 65°C, keep warm for 30 minutes, then add 0.2 parts of azobisisobutyl cyanide dropwise, react for 1.5 hours, keep the temperature unchanged, add the remaining monomer dropwise into the flask, react for 2 hours, raise the temperature to 75°C, react for 4 hours, and after the reaction solution is cooled to room temperature, add 150 parts of ethyl acetate solvent to dilute it, stir evenly, and obtain a polymer adhesive.

[0081] Step 2: Prepare protective film

[0082] 1. Weigh 100 parts of the polymer adhesive prepared above, add 2 parts of polythiophene antistatic agent, 3.5 parts of isocyanate curing agent L75 (Covestro), 1 part of epoxy curing agent TETRAD-C (Mitsubishi Chemical), dilute to a suitable viscosity with 40 parts of ethyl acetate solvent, and obtain the corresponding adhesive by high-speed mechanical stirring.

[0083] 2. The adhesive prepared above is evenly coated on the PET substrate layer, dried and foamed in an oven to form an acrylic adhesive layer with a thickness of 50 μm, and finally a release film is attached to form an acrylic protective film; the oven temperature is as follows: the temperature of the first section oven is set to 60°C, the temperature of the second section oven is set to 75°C, the temperature of the third section oven is set to 75°C, the temperature of the fourth section oven is set to 135°C, the temperature of the fifth section oven is set to 135°C, the temperature of the sixth section oven is set to 135°C, and the temperature of the seventh section oven is set to 75°C; the machine speed is 15 m / min, and the length of each oven section is 6 m.

[0084] The acrylic protective films prepared in Example 1 and Comparative Examples 1-3 were subjected to the following performance tests:

[0085] 1. 180° peel strength test method: According to the ASMT D3330 pressure-sensitive tape peel strength test standard, cut 25.4mm*300mm specimens, attach them to the test steel plate, roll them back and forth twice with a 2kg roller at a speed of 600mm / min, let it stand for 20 minutes, and then test the 180° peel strength at a test speed of 300mm / min;

[0086] 2. Peel strength after baking at 70℃ for 3 days: Also test according to the ASMT D3330 pressure-sensitive tape peel strength test standard, cut 25.4mm*300mm specimens, fit the test steel plate, roll back and forth twice with a 2kg roller at a speed of 600mm / min, put it in a 70℃ aging box, take it out after 3 days and place it for 2h, then test the 180° peel strength at a test speed of 300mm / min;

[0087] 3. Peel strength after aging at 65℃ / 95%RH for 3 days: Also test according to the ASMT D3330 pressure-sensitive tape peel strength test standard, cut 25.4mm*300mm specimens, fit the test steel plate, roll back and forth twice with a 2kg roller at a speed of 600mm / min, put it in a 65℃ / 95%RH aging box, take it out after 3 days and place it for 2h, then test the 180° peel strength at a test speed of 300mm / min;

[0088] 4. Camera module bonding performance: According to the actual bonding application test, cut a 5cm*5cm square sample, bond it to the camera module, press it with a 500g weight for 10s, and place it in a 65℃ / 95%RH aging box. After 3 days, take it out and place it for 2h, then peel it off manually to observe whether there is super black adhered on the surface of the tape and whether there is super black defect on the surface of the camera module;

[0089] The test results are shown in Table 1 below:

[0090] Table 1

[0091]

[0092] According to the test results in Table 1, it can be seen that the addition of the antistatic agent polythiophene can effectively reduce the electrostatic force of the tape itself and reduce the super black shedding caused by the electrostatic force during the tearing process. In addition, as in Comparative Example 3, the addition of an excessive amount of soft monomer butyl acrylate and the absence of a hard monomer cyclohexyl methacrylate can greatly improve the peeling force and aging peeling force performance of the tape. This is because an excessive amount of soft monomer can greatly reduce the Tg point of the polymer adhesive, improve the flexibility of the polymer adhesive molecular chain segments, and accelerate the movement of the molecular chain segments, thereby leading to an increase in the bonding force during the aging process of the acrylic adhesive layer, and promoting the super black shedding of the camera module surface during the waste discharge process.

[0093] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to specific details.

Claims

1. An acrylic protective film for a camera module, characterized in that: It includes a substrate layer, an acrylic adhesive layer and a release layer which are stacked in sequence; The acrylic adhesive layer is obtained by coating an acrylic adhesive solution on the substrate layer and then curing the acrylic adhesive solution. The acrylic adhesive solution comprises the following raw material components in parts by weight: 100 parts of a polymer adhesive, 1-5 parts of an antistatic agent, 0.5-8 parts of a curing agent, and 10-80 parts of a solvent.

2. The acrylic protective film for camera module according to claim 1, characterized in that: The raw materials for preparing the polymer adhesive include, by weight: 50-150 parts of soft monomer, 5-20 parts of hard monomer, 2-10 parts of functional monomer, 0.05-0.6 parts of initiator, and 50-200 parts of solvent.

3. The acrylic protective film for a camera module according to claim 2, characterized in that: The soft monomer is at least one of ethyl acrylate, butyl acrylate and isooctyl acrylate; The hard monomer is at least one of methyl acrylate, methyl methacrylate, glycidyl methacrylate, cyclohexyl methacrylate, styrene and vinyl acetate; The functional monomer is at least one of acrylic acid, methacrylic acid, acryloylmorpholine, hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate and maleic anhydride.

4. The acrylic protective film for a camera module according to claim 2, characterized in that: The initiator is at least one of azobisisobutyronitrile, azobisisoheptanenitrile and tert-butyl peroxyhexahydroterephthalate.

5. The acrylic protective film for a camera module according to claim 2, characterized in that: The raw materials for preparing the polymer adhesive include, by weight: Soft monomer butyl acrylate 30-70 parts, soft monomer isooctyl acrylate 20-50 parts, hard monomer cyclohexyl methacrylate 5-20 parts, functional monomer acrylic acid 1-5 parts, functional monomer acryloyl morpholine 1-5 parts, initiator azobisisobutyronitrile 0.05-0.5 parts, initiator tert-butyl peroxide hexahydroterephthalate 0.01-0.1 parts, solvent 50-200 parts.

6. The acrylic protective film for a camera module according to claim 2, characterized in that: The preparation method of the polymer adhesive comprises the following steps: S1, mixing soft monomers, hard monomers and functional monomers to obtain a monomer mixture, and adding a portion of the monomer mixture into a reaction container; S2, after passing nitrogen into the reaction vessel for 10-30 minutes, heat to 55-70°C and continue stirring, keep warm for 0.5 hours, add part of the initiator dropwise, and react for 0.5-3 hours; S3, keeping the temperature constant, adding the remaining monomer mixture dropwise into the reaction vessel, and reacting at 55-70° C. for 0.5-3 hours; S4, raising the temperature to 65-80°C, adding the remaining initiator dropwise, and reacting for 2-5 hours; S5. After the reaction product is cooled to room temperature, a solvent is added to dilute and stir to obtain a polymer adhesive.

7. The acrylic protective film for a camera module according to claim 1, characterized in that: The antistatic agent is at least one of polypyrrole, polythiophene and polyaniline.

8. The acrylic protective film for a camera module according to claim 1, characterized in that: The cross-linking agent is at least one of an isocyanate curing agent, an epoxy curing agent, an aziridine curing agent, and a triethylenetetramine curing agent.

9. The acrylic protective film for a camera module according to claim 1, characterized in that: The solvent is at least one of toluene, ethyl acetate, ethanol, propanol, butanol and butanone.

10. A method for preparing an acrylic protective film for a camera module according to any one of claims 1 to 9, characterized in that: The following steps are involved: The polymer adhesive, antistatic agent, curing agent and solvent are uniformly mixed to obtain an adhesive, the adhesive is coated on a substrate, and the adhesive is dried and cured at 60-130° C. to form an acrylic adhesive layer, a release layer is attached to the adhesive surface of the acrylic adhesive layer, and the adhesive is cured at 50-70° C. for 48-72 hours to obtain an acrylic protective film for a camera module.

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